Yuvi produced a funny and accurate code of conduct for Twitter that is so eerily familiar, I had to check my closet to make sure he wasn't watching me. Go read it and then let the Twitter enjoyment rise within you.
I have one more tip to offer. If you are not using and regularly reading saved searches in Twitter, you are truly missing half the value of the service. Twitter can be a great research tool:
Twitter can also be one of the funniest public forums when unrelated tweets are corralled together by the force of saved searches.
Thanks for the laughs Twitter.